Hi, We had watched ads regarding “Blue” cat and dog food. We bought a bag and mixed it in with our cat’s food, gradually. Just shy of $400 later our Tonkinese is out of the woods and on the mend. She could NOT digest the Blue food and became VERY constipated. Three X-rays, a cat Fleet, etc. and new food she’s back to “normal” . PLEASE Double check if your cat’s breed is able or unable to digest the food. The two different vets here said that Blue has been a problem. Follow the poop closely whenever you change or introduce a new food.